<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>el:挂载点</title>
</head>
<body>

    {{message}}
    <div class="app">
        {{message}}
        <span>{{message}}</span>
    </div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

<script>
    var app = new Vue({
        el:"div",
        data:{
            message:"黑马那"
        }
    })
</script>
</body>
</html>